campbell and the m.i.t. police officer shot down, sean collier. yes the city has the jubilation and also the tragedy and some of the victim's families responded to the arrest, john, the brother of krystle campbell telling "the boston globe" he's glad this arrest happen and it doesn't bring his sister back and the sentiment echoed by the richard family saying none of this will bring back our beloved martin so you still have a long, long way to go here. >> nothing will bring back their children, their brothers, their sisters. poppy harlow in watertown, thank you so much. >> the richard family still has the recovery of their daughter and the mother. so this is just still just the beginning for the families. spokesman for russian president vladimir putin says russia wants to get official information on the boston bombing suspects from the united states and expects there to be contact between investigators of both countries. >> how likely is this? let's ask barbara starr joining us now. what do we know about this